Touch Insulating Layer Layout Against Polarizer Shrinkage Stress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices experience increased defect rates due to stress concentration on touch insulating layers caused by polarizer shrinkage under high temperature and high humidity conditions, leading to damage of underlying films.
Innovation Solution
The ends of the touch insulating layers are spaced apart from the polarizer ends, and the layers are designed with varying materials and thicknesses to disperse stress and reduce damage, using organic and inorganic insulating materials alternately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the polarizer is positioned directly over the touch insulating layers, then the structure is simplified and alignment is easier, but stress concentration occurs on the touch insulating layers causing damage to underlying films
Solution Approach 1:
The patent extracts the polarizer from direct alignment with the touch insulating layers by positioning it in the non-active area, separating the stress-generating element from the vulnerable components. This extraction eliminates the stress concentration pathway while maintaining functional integrity.
Solution Approach 2:
The patent introduces a space or buffer zone as an intermediary between the polarizer and the touch insulating layers. This intermediary region acts as a stress buffer, preventing direct transmission of shrinkage stress to the underlying films while maintaining the necessary structural relationships.
2Area of stationary object
If the touch insulating layers extend to the edge of the polarizer, then the coverage is maximized, but stress from polarizer shrinkage concentrates on the layers causing damage
Solution Approach 1:
The patent applies local quality by making the touch insulating layers have different extensions in different regions. Specifically, the layers extend into the non-active area but stop before the polarizer boundary, creating a localized design that provides coverage where needed while avoiding stress-concentration zones.
Solution Approach 2:
The patent segments the touch insulating layers into distinct regions with different extension characteristics. The layers are divided such that they cover the active area fully while having reduced extension in the non-active area near the polarizer, creating segmented coverage that balances protection and stress distribution.
3Adaptability or versatility
If the polarizer shrinks under high temperature and humidity conditions, then the material responds to environmental changes, but stress is applied to touch insulating layers causing defects
Solution Approach 1:
The patent converts the harmful shrinkage stress into a beneficial design feature by using the stress distribution pattern to determine the optimal extension boundaries of the touch insulating layers. The layers are designed to extend just enough to provide coverage while stopping before the stress-concentration zone, effectively using the stress characteristics to guide the design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively suppresses stress concentration on touch insulating layers, reducing defect rates and improving reliability by minimizing damage to the insulating layers and underlying films.
Implementation Method 1
even though a polarizer is shrunk when the high temperature and high humidity reliability is evaluated, a stress caused by the shrinkage is not applied to a plurality of touch insulating layers
Data Source
AI summary
The present disclosure relates to a display device including a first substrate including an active area and a non-active area which encloses the active area, a display unit disposed on an upper surface of the first substrate, an encapsulation unit which covers the display unit, a touch panel disposed on the encapsulation unit, an adhesive layer which bonds the touch panel and the first substrate, and a polarizer disposed on the touch panel, the touch panel includes a plurality of touch insulating layers and a touch electrode and ends of the plurality of touch insulating layers are spaced apart from an end of the polarizer.